Head turns when in back of boat

Whenever I get into a boat that someone else is in, my head starts turning left. It lets you try to turn whatever way you want, but it doesn't stop turning. It doesn't matter if the boat is turning, moving straight, or staying put, it still happens as long as I am in that back. If the person in the front of the boat gets out and I move into the front, it stops and I can fully control where I want my head to be looking at.